Transducer replacement disc for optimyst fire If your Opti- fire had stopped misting, there is a possible problem with the transducer. Try to replace the disc of the transducer, it can help your electric smoke effect to return. Application: If your optimyst light lacks fog or stops fog, the transducer disc can help solve the problem. Compatible with: The diameter of the replacement discs is 20 mm, like Optimyst spare parts, it is suitable for electric heating. Long service life: the transducer discs with high quality material, anti-aging, anti-, can last for a long time up to 5000 hours. Replacement transducer disc. Excellent replacement for smoke effect lights.